Functional Check - Racal Instruments 2251A Operator's Manual

3.4

Functional Check

3.4.1 Introduction
The following procedure verifies that the 2251A can accept, process, and transmit device-
dependent messages over the VXIbus. (The Logical Address is set to 03 when shipped from
the factory, and will be used in all examples.)
The following sequence will use the command WSWrt. This is a short way of indicating the
following device-dependent commands are transmitted to the 2251A using the Word Serial
Write protocol of the VXIbus Specification (to which the counter conforms). The command
WSRd indicates that data is to be read from the 2251A using the VXIbus specified Word
Serial Read protocol.
3.4.2 VXIbus Communication Check
Perform the following procedure:
a.
b.
Send the IEEE-488.2
command "*TST?"
c.
d.
Action
Read Data
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Power-on the counter.
Test as shown below:
Action
Verify the TRIG A LED and the GATE LED are flickering.
Read the data in the output buffer by performing the following:
Command
WSRd 03
Command
WSWrt 03
"*TST?" <LF>
Self Test Data
"0" = Pass "1" = Fail
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